<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        table {
            font-size: 30px;
            width: 300px;
            margin: 0 auto;
            text-align: left;
            table-layout: auto;
            border-collapse: collapse;
            border: chocolate 1px solid;
        }
        td{
            border: chocolate 1px solid;
        }
    </style>
</head>
<body>
<table>
    <tr>
        <td>就1列就1列就1列就1列就1列</td>
        <td>当父级relative，且宽度很小的时候，例如...</td>
        <td>当父级relative，且宽度很小的时候，例如...</td>
    </tr>
</table>

</body>
</html>